from the initial Liberty menu choose 5. Liberty Functions and then 2. File Editor and when asked to name the file give some descriptive name (so long as it has NO SPACES) and hit <ENTER> to see the workspace. Then type your text and when it's complete hit <CONTROL><X> (answer YES to 'save modified buffer', then <ENTER> to save it as you've named it and it will be saved to your Liberty home directory (to check this: from the initial Liberty menu choose 5. Liberty Functions and then 1. UNIX, and at the $ prompt type ls to list your home directory. To return to the Liberty menu from the $ prompt, type menu and hit <ENTER> twice.)
To post your completed text to the usenet group: Connect to the group, call up the message in the thread you want to follow up, and hit F . Once the cursor is in the message field, hit <ENTER> once to be sure you've got a blank line at the top, hit <CONTROL><R> (for 'retrieve' I suppose) and type the filename in the space, then hit <ENTER>. Your text will be fetched and pasted in. Hit <CONTROL><X> and then <ENTER> to complete the posting.
When you have no further use for the text saved in your directory you will probably want to delete it to release the disk space it occupies. At the Liberty $ prompt type rm filename (e.g., rm helminths) to remove the file.